Answer:
0.3375
Explanation:
w = angular speed of the DVD drive = 100.0 rpm = [tex]100.0 \frac{rev}{min}\frac{2\pi rad}{1 rev}\frac{1 min}{60 sec}[/tex] = [tex]10.5\frac{rad}{sec}[/tex]
m = mass of the dime = 2 g = 0.002 kg
r = radius = 3 cm = 0.03 m
μ = Coefficient of friction
The frictional force provides the necessary centripetal force to move in circle. hence
frictional force = centripetal force
μ mg = m r w²
μ g = r w²
μ (9.8) = (0.03) (10.5)²
μ = 0.3375
